Member Since: 24 Sep 2018
Location: Manchester
Posts: 26
Heating problem in my MY10 Disco 4 HSE.
Legends.... I was hoping some of you could help diagnose a problem I have with the heating in my MY10 Disco 4 HSE.
Problem goes like this, the passenger side blows completely cold air, even on full temp, regardless of direction of heat flow. Drivers side blows only luke warm.
So, the only way I can kinda heat the cabin was to have only the face vents on, with all passenger vents closed.
Recently i found it has become worse. Only the centre, drivers side vent will blow warm air, right hand of the steering wheel vent is now also blowing cold.
I had resorted to taping up the passenger screen and footwell vents and having the heating set to screen only. This blows only warm air and by the time it has hit the screen and then me, it is cold
Best scenario now, is not to use any of the vents and just have the heating on high, so it just eminates into the cockpit from every orrifice in the dash (punch myself in the face emoticon)
Rear vents are cold too.
I have taken the driver side footwell panel off, to reveal the heater matrix. Both pipes are red hot.
I bought an iid tool and re learned the actuators limits and the stepper motor, but no dice there unfortunately.
Air con works great.
Blown up diagram (attached) would suggest the blend flap.
But that doesn’t explain the different temps from passenger and drivers side.
Penny for your thoughts
17th Mar 2019 10:07 pm
caravangler
Member Since: 24 Sep 2018
Location: Manchester
Posts: 26
Anyone?
14th Apr 2019 11:15 am
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978
I've changed the title of the thread to assist 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
14th Apr 2019 11:28 am
caravangler
Member Since: 24 Sep 2018
Location: Manchester
Posts: 26
Thanks
14th Apr 2019 11:33 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73086
Preferred the original title.
14th Apr 2019 12:49 pm
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
The flap n° 7, in reality, there are two, one for the right side and one for the left side.
Member Since: 12 Jan 2015
Location: Gloucestershire
Posts: 52
Hi
Did you ever get to the bottom of the problem - have exact same problem and looks like I might have to have the dash strippedLoving my D4 HSE -MY10......!!!!
16th Dec 2019 10:58 pm
caravangler
Member Since: 24 Sep 2018
Location: Manchester
Posts: 26
How bizarre!
ill save you the 5 hour job because as it happens, I stripped the car yesterday and changed both the temp flap blend motors, then did the stepper motor initialisation on the iid tool. No change.
Though there was a strange smell after I turned the heating on, like something was heating up that hadn’t for a long time. Heating still didn’t work though.
So I am drawn to the conclusion that it must be the Heater matrix.
17th Dec 2019 8:20 am
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 889
I back flushed my matrix. Sorted!
SteveYou remind me of a younger me, not much younger mind...perhaps even a little older!
17th Dec 2019 2:39 pm
caravangler
Member Since: 24 Sep 2018
Location: Manchester
Posts: 26
I am planning on doing that today. Though I would appreciate a walkthrough just for clarification if you could Steve.
Was it the same problem as mine?
Thanks.
17th Dec 2019 2:51 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 889
It’s the 2 hoses top lh side of engine. I clamped the hoses and disconnected. Pushed air through to clear and put warm water in from the pressure washer. Then pumped radiator cleaner through. Left for 10 mins and blasted both ways with hot water, cold water and air.
Finally blew out air and then pumped in coolant to try and make air locks less likely. Reconnect hoses and run up. Top up as required.
SteveYou remind me of a younger me, not much younger mind...perhaps even a little older!
17th Dec 2019 3:30 pm
caravangler
Member Since: 24 Sep 2018
Location: Manchester
Posts: 26
Thanks. Just out of interest did you flush at the bulk head or at the rubber joint hose above the engine?
17th Dec 2019 8:00 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 889
Bulkhead.
SteveYou remind me of a younger me, not much younger mind...perhaps even a little older!
17th Dec 2019 9:00 pm
Dboss
Member Since: 12 Jan 2015
Location: Gloucestershire
Posts: 52
Good info guys....
I used bore-scope down the centre vents and can clearly see the face vent flap opening and closing correctly and also when its open I can see the no:7 and no:4 flaps opening and closing as I vary the temp on either side.
So I'm guessing matrix flush needed. I'm no a great fan of digging around int he engine area, but I did notice the anti-freeze level was very low on the top up bottle, so thought awesome that's the problem, but have topped up and makes no difference even after driving around a bit till got to full temp.
Is there a photo guide anywhere to finding these pipes and what about bleeding the system that I hear about, could that be my problem - air in the system that needs bleeding?Loving my D4 HSE -MY10......!!!!
22nd Dec 2019 10:54 am
jenseneverest
Member Since: 12 Jun 2017
Location: somewhere
Posts: 769
With a cold car, start engine
Put all heating on full hot
Fill coolant to "full" mark, replace cap and drive until engine hot, recheck coolant.
Assuming that is okay then try a rad flush kit, dive it for 30 plus miles with the flush in there
As your getting some heat out of it, hopefully it clears any blockages, flush full system with clean water.
If heating is now okay, then drain and replace water with antifreeze, otherwise repeat the flush kit job.
Check the coolant for debris when your flushing.....
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